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Using terahertz cascade lasers for determination of optical losses in active medium of silicon intracenter lasers

Pavlov, S.G. and Eichholz, René and Abrosimov, N.V. and Riemann, H. and Wienold, M. and Schrottke, L. and Giehler, M. and Hey, R. and Grahn, H.T. and Tredicucci, A. and Beere, H.E. and Ritchie, D.A. and Hübers, H.-W. (2010) Using terahertz cascade lasers for determination of optical losses in active medium of silicon intracenter lasers. In: Proc. of the 2nd IEEE Int. Workshop on THz radiation: Basic Research and Applications, pp. 245-247. IEEE. TERA 2010, 12.-14. Sep. 2010, Sevastopol, Ukraine. ISBN 978-1-4244-6995-6

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Abstract

Terahertz-range intracenter silicon lasers have demonstrated significant progress over past decade in expanding the frequency operation range, in manipulation of a silicon matrix as well as in lowering of optical pump threshold. While terahertz gain realized in silicon lasers has been already defined, optical losses in the active media have not been yet measured experimentally. We applied continuous wave terahertz quantum cascade lasers, operating at 2.5 THz and 3.1 THz for direct measurements of the light losses at conditions of optical pumping with pump intensities exceeding laser thresholds for corresponding media. These measurements allow estimates of THz losses as well as determination of physical mechanisms mainly contributing for total THz absorption in optically excited silicon. It was found that absorption by so called D¯-centers, dynamically induced in optically excited silicon, cause major loss of THz emission. These losses, however, can be significantly reduced by a proper procedure of crystal growth and doping.

Item URL in elib:https://elib.dlr.de/67362/
Document Type:Conference or Workshop Item (Speech)
Title:Using terahertz cascade lasers for determination of optical losses in active medium of silicon intracenter lasers
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Pavlov, S.G.sergeij.pavlov (at) dlr.deUNSPECIFIED
Eichholz, Renérene.eichholz (at) dlr.deUNSPECIFIED
Abrosimov, N.V.Institute of Crystal GrowthUNSPECIFIED
Riemann, H.Institute of Crystal Growth, BerlinUNSPECIFIED
Wienold, M.Paul-Drude-Institut für Festkörperelektronik, Berlin, GermanyUNSPECIFIED
Schrottke, L.Paul-Drude-Institut für Festkörperelektronik, Berlin, GermanyUNSPECIFIED
Giehler, M.Paul-Drude-Institut für Festkörperelektronik, Berlin, GermanyUNSPECIFIED
Hey, R.Paul-Drude-Institut für Festkörperelektronik, Berlin, GermanyUNSPECIFIED
Grahn, H.T.Paul-Drude-Institut für Festkörperelektronik, Berlin, GermanyUNSPECIFIED
Tredicucci, A.NEST CNR-INFM and Scuola Normale Superiore, Pisa, ItalyUNSPECIFIED
Beere, H.E.Cavendish Laboratory, University of Cambridge, Cambridge, United KingdomUNSPECIFIED
Ritchie, D.A.Cavendish Laboratory, University of Cambridge, Cambridge, United KingdomUNSPECIFIED
Hübers, H.-W.heinz-wilhelm.huebers (at) dlr.deUNSPECIFIED
Date:2010
Journal or Publication Title:Proc. of the 2nd IEEE Int. Workshop on THz radiation: Basic Research and Applications
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Page Range:pp. 245-247
Publisher:IEEE
ISBN:978-1-4244-6995-6
Status:Published
Keywords:THz, silicon laser, quantum cascade laser
Event Title:TERA 2010
Event Location:Sevastopol, Ukraine
Event Type:international Conference
Event Dates:12.-14. Sep. 2010
Organizer:Sevastopol, Ukraine
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Transport
HGF - Program Themes:Traffic Management (old)
DLR - Research area:Transport
DLR - Program:V VM - Verkehrsmanagement
DLR - Research theme (Project):V - FAMOUS (old)
Location: Berlin-Adlershof
Institutes and Institutions:Institute of Planetary Research > Terahertz and Infrared Sensors
Deposited By: Pavlov, Dr. Sergey
Deposited On:04 Jan 2011 21:52
Last Modified:01 Dec 2018 19:47

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